[clang] [llvm] [ARM][Clang] Make `+nosimd` functional for AArch32 Targets (PR #130623)

[Jack Styles via llvm-commits]

================
@@ -38,6 +38,9 @@ Potentially Breaking Changes
 - Fix missing diagnostics for uses of declarations when performing typename access,
   such as when performing member access on a '[[deprecated]]' type alias.
   (#GH58547)
+- For ARM targets, when using cc1as, the features included in the selected CPU or
+  Arch's FPU are now loaded and utilized. If you wish not to use a specific feature,
+  this will need appending to the command line used.
----------------
Stylie777 wrote:

I think there were some cases such as NEON which now are detected when using `cc1as` that were not before as I am still not 100% sure if cc1as got the features from the FPU once inside `cc1as`. I could not find anywhere that this was done anyway.

This change _could_ lead to a user needing to disable features if they wish to do so. However, with assembler I don't think that is as important as if this was `cc1` as the assembly instructions will already be defined. This entry was more to ensure people were aware incase there was some confusion as to what this change was and its potential impact.

https://github.com/llvm/llvm-project/pull/130623